We can use the rule of three where we know that 1000g is equivalent to 1kg, then how many Kg is equivalent to 400 g. So:
1000 g ---------- 1 Kg
400 g ---------- X
Where X is the number of Kg equivalent to 400 g.
Therefore, solving for X, we get:
[tex]X=\frac{400\text{ g}\cdot1\text{ Kg}}{1000\text{ g}}=0.4\text{ Kg}[/tex]Answer: 400 g = 0.4 Kg
